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I N T ERN AT1 O N A L ORGAN I Z AT1 Q N FOR STAND AR D I ZATl O N
IS0 RECOMMENDATION
R 678
MODULES AND DIAMETRAL PITCHES
OF STRAIGHT BEVEL GEARS
FOR GENERAL ENGINEERING AND HEAVY ENGINEERING
1st EDITION
March 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
be authorized therefore only
documents, in any country, may
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 678, Modules and diametral pitches of straight bevel gears
jOr getieral etigineering and heavy engineering, was drawn up by Technical Committee
ISO/TC 60, Gears, the Secretariat of which is held by the institut Belge de Normali-
sation (IBN).
Work on this question by the Technical Committee began in 1962 and led, in
1965, to the adoption of a Draft IS0 Recommendation.
884) was circulated
In December 1965, this Draft IS0 Recommendation (No.
to all the IS0 Member Bodies for enquiry. It was approved, subject to a few modifi-
cations of an editorial nature, by the following Member Bodies :
Argentina India Sweden
Australia Israel Switzerland
Austria
Italy Turkey
Belgium
Japan United Kingdom
Brazil Net herlands U.S.S.R.
Bulgaria
New Zealand Yugoslavia
Chile
Poland
Czechoslovakia Portugal
France
South Africa,
Germany Rep. of
Hungary Spain
No Member Body opposed the approval of the Draft.
The D
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